# frozen_string_literal: true

def possible?(num1, num10, cost)
  pay = num1 + num10 * 10
  pay >= cost &&
    A + B - num1 - num10 + (pay - cost).divmod(10).sum == C
end

# ---------------------------------------------------------- exec

A, B, C = gets.chomp.split.map(&:to_i)

RESULT = (1..A + 10 * B).find do |cost|
  (0..B).find { |b| (0..A).find { |a| possible?(a, b, cost) } }
end || 'Impossible'

puts RESULT